FOR THE WILD BERRY SYRUP:

In a small pot, combine mixed berries with equal parts sugar and water over medium heat. Bring to a boil, reduce to a simmer and let sit for 20 minutes. It is done once the liquid is dark purple and the berries are soft. Strain the berries from the simple syrup with a mesh strainer. Press down on the berries to get extra flavor. Refrigerate until cold.

FOR THE COCKTAIL:

In a shaker, add vodka and wild berry syrup and shake vigorously. Strain over ice and top with 7UP. Garnish with a berry skewer and mint sprig.